Advertising projector



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eeeeoo 1,529,784 G. L. GROW v ADVERTI S ING PROJECTOR March 17, 1925.

Filed Aug. 1o. 1925 2 sheets-'sheet 2 ff 6i zu? Jmf- Patented Mar. 17, 1925.

UNITEDSTATES GEORGE L. GRVI, ADE COVINGTON; KENTUCKY.

ADvEnTIsrNe' PROM-cron.

Application filed August 10, 1823.

10 @ZZ @einem it may concern:

Be it known that GEORGE L. GROW, a citizen of the United `States, and a resident of Covington, in the county of Kenton and State of Kentucky, vhave invented certain new and useful improvements in Advertising Projectors, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

My invention relates tol machines such as are employed for projecting on a. screen advertising matter from photographic plates in which a number of different illustrations are presented in series, each exposed for a limited time and then automatically changed for the succeeding plates.

The object of the invention is to provide a convenient and effective apparatus for mounting the photographic slides and for bringing each slide 4automatically between the light and thev projecting lens, and c1;- posing saine for a limited time.

rlfhe invention consists of that cert-ain novel construction and arrangement of parts to be hereinafter particularly pointed out and claimed, whereby the above results are attained.

In the drawings:

Figure'l 'is a perspective view of the apparatus with, the enclosing casing removed.

Figure 2 is a vertical section taken through the plate reels with parts in front elevation. i

Figure 3 is a detail section taken in the line of Figure 2.

Figure l is a perspective. View of one of the slide holders.

The apparatus is mounted in a substantial frame l, preferably U-bars of the necessary side and cross pieces upon which is mounted the projecting lens 2, and the casing 3a enclosing the lignt, no special description of which need be given, as these parts form no part of the present invention, which as stated relates t-o the slide holder and its operating mechanism.

Suitably journaled in standards 3, 3, on the main frame, is a shaft 4 which carries a spool 5 square in cross section, enclosed in guide disks 6, 6, at each end. On the outside of the journal bearing for the shaft L is secured a hub 7,\carrying four arms or spokes 8, 8, 90 degres apart. These spokes are engaged intermi tently by an arm terminating in a bent o've'r o-r hooked portion( Serial No. 658,726.

l() to properly engage the spokesThe' arm 9 l is secured to shaft 11 journaled in'the frame `and carrying a gear v12'whic'h in "turn engages a worin 1B' o-n `shaft' le driven byfa. suitable electric inotorl' or other source of power. The speed of the motor or other driving power will determine the-speed `of the intermittent rotation of the'sqiiaref'spool as will be readily understood. r)The construction of the sliderv holders which carry the slides and whiclraref'connected in series to form anendles'scha'in constitutes one of the important'features of my invention. l

@ne of these holders is illustrated in'Figure 1t comprises a sheet metal frame of-base 16 and sides 1T, 17,with the upper ends turned over to formtoingues- 18,'18. Fiars 19 are turned upout of the metal for the base and sides whichI form retaining clips f r the slide. To insert the slide in ,the iolder, all that it is necessary to" do is'to prin-g out the sides 1-7 slightly to permit the ilidel to pass thetongues and seat it in the j'uid'e clips' l), and releasing the 'sidesy the tongues cover the open edge of the slideand heid` it 'iiriuly in place An endless chain is Vmade up of these' slide' holders by securing themsidebyrside with rings or loops 20.

As many" of these slide holders arefenipi /yed as "there may be advertisen'ients A[for displaj, and the chain may be lengthened or shortened 'by the 'addition oiue'inoval of the holders.

The chain open is hung over the square spool 5 and then the free ends are hooked together to form an endless chain. The width of the square faces of the spool 5 is just sufficient to hold the base of one slide holder and the loops 2O are sufficiently loose to permit the adjacent holders to occupy a right angled position to the intermediate holder. To more effectively permit this po sitioning, the edges of the square spool are grooved at 2l to receive the loops 20.

To hold the square spool in position after each quartervturn, I provide a spring pressure bar 22 (Figure 3), one end of which is secured to the standard 3, and the other end 23 slightly curved, bea-rs on top of the spool 5, so that the spool is held securely in proper position.

In order to maintain the endless chain of holder from swinging loose, I run the chain at the lower end over a guide roller 24, which is mounted on a. shaft 25, the ends of Which are journaled in slotted bars 26, 26 depending from the main frame. An adjustable spring plate 27 on each side secured by a screw 28 in its respective slot 29 of the bar 26 exerts the proper tension on the guide roller 24 to maintain-the tautness desired.-

The operation of the apparatus Will be obvious. VSlide holders are made up of the number of slides to be projected, and each slide is readily and easily mounted in the holder. The motor is started and depending on its speed, which is greatly reduced by the Worm and gear construction, the square spool will be rotated a quarte-r turn each time the arm 9 contacts With one of the spokes 8 to bring the next succeeding slide in front of the projecting lens Where the slide Will remain until the gear l2 has made rotation to bring the arm 8 back to its former position, and into contact With the neXt spoke.

By reason of the pressure of the spring plate 22 as soon as the edge of the square block passes the vertical position, the spring pressure Will snap the block into its next position, thus bringing the next sli-de into projecting position.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In Yan apparatus of the character specified, means for carrying and intermittently presenting photographic slides to a projecting device, comprising a series of sheet metal slide holders, and loops loosely connecting them together side by side vin an endlessV chain, a rotatable block, square in cross section over Which said chain is suspended, and a floating roller under spring tension around Which the endless chain is drawn, arms projecting at right angles from the block, With a power operated shaft, carrying an arm to contact With said block arms in turn to shift the same intermittently a quarter of a. revolution.

2. In any apparatus of the character specified, a series of sheet metal slide holders, each formed from an integral resilient strip of sheet metal folded to form an open rectangular holder, With tongues bent inwardly to form the top and with lugs bent up from the strip to hold the slides With the sides of the holder adapted to be sprung out to receive the slides, and loops to connect the slide holders into an endless chain, and means for moving the chain to present one slide holder at a time to the projecting lens.

3. In an apparatus of the character specified, aseries of resilient sheet metal slide holders, each formed from an integral strip of sheet metal folded to form aholding frame adapted to be sprung out to receive the slides, with loops to connect the holders into an endless chain, said chain supported on a horizontal rotatable support Vfor driving same, with an idler roller at the bottom of the chain, With spring bearing on said roller to maintain tension on the endless chain, as it is shifted.

4. In an apparatus of the character specified, a series of sheet metal slide holders,

each formed from an integral strip of sheet metal folded to form a holding frame, With loops to connect the holders into an endless chain, said chain supported on a horizontal rotatable support for driving same, with an idler roller at the bottom of the chain, slotted depending bars in which said roller is adjustably mounted, With adjustable springs secured to said bars, bearing upon the roller spindle to maintain and adjust the tension on the endless chain.

GEORGE L. GROW. 

